Effect of molecular energy level of electron transport layer on recombination zone in OLED

Charge balance, high carrier density and high exciton recombination probability are crucial in achieving high device efficiency that can be done by aligning the bands at the interface between emitting and electron transporting layers (ETLs). We demonstrate here a comprehensive model with the aid of SETFOS to quantitatively investigate the effects of highest and lowest occupied molecular orbital (HOMO and LUMO) levels of the electron transport layer of the carrier accumulation and exciton generation in organic light emitting diodes. The simulation results show that the recombination in the emissive zone is highly influenced by energy levels of ETL and charge balance in the OLED can be controlled by tuning the HOMO and LUMO levels of ETL.